Add StopMotionVectorDrawable to uicommon

The StopMotionVectorDrawable provides control over the position
within an animation set of the warpped AnimatedVectorDrawable.

Change-Id: I586c54c7dbd5c9f6f373a87e544bc0669f4ba8f1

1 files changed, 97 insertions, 0 deletions

diff --git a/src/org/cyanogenmod/graphics/drawable/StopMotionVectorDrawable.java b/src/org/cyanogenmod/graphics/drawable/StopMotionVectorDrawable.java
new file mode 100644
index 0000000..869c866
--- /dev/null
+++ b/src/org/cyanogenmod/graphics/drawable/StopMotionVectorDrawable.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package org.cyanogenmod.graphics.drawable;
+
+import android.animation.Animator;
+import android.animation.AnimatorSet;
+import android.animation.ValueAnimator;
+import android.graphics.drawable.AnimatedVectorDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.DrawableWrapper;
+import android.util.Log;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+
+/**
+ * Wraps an {@link AnimatedVectorDrawable} and provides methods for setting the temporal position
+ * within the backing {@link AnimatorSet} of the wrapped {@link AnimatedVectorDrawable}.
+ */
+public class StopMotionVectorDrawable extends DrawableWrapper {
+    private static final String TAG = StopMotionVectorDrawable.class.getSimpleName();
+
+    private AnimatedVectorDrawable mDrawable;
+    private AnimatorSet mAnimatorSet;
+
+    /**
+     * Creates a new wrapper around the specified drawable.
+     *
+     * @param dr The drawable to wrap.  Must be an {@link AnimatedVectorDrawable}
+     */
+    public StopMotionVectorDrawable(Drawable dr) {
+        super(dr);
+        setDrawable(dr);
+    }
+
+    /**
+     * {@see DrawableWrapper$setDrawable}
+     * @param dr the wrapped drawable
+     * @throws IllegalArgumentException IF drawable is not an {@link AnimatedVectorDrawable}
+     */
+    @Override
+    public void setDrawable(Drawable dr) {
+        if (dr != null && !(dr instanceof AnimatedVectorDrawable)) {
+            throw new IllegalArgumentException("Drawable must be an AnimatedVectorDrawable");
+        }
+
+        super.setDrawable(dr);
+        mDrawable = (AnimatedVectorDrawable) dr;
+        if (mDrawable != null) {
+            mDrawable.reset();
+            getAnimatorSetViaReflection();
+        }
+    }
+
+    /**
+     * {@see android.animation.ValueAnimator#setCurrentFraction}
+     * @param fraction The fraction to which the animation is advanced or rewound. Values outside
+     *                 the range of 0 to the maximum fraction for the animator will be clamped to
+     *                 the correct range.
+     */
+    public void setCurrentFraction(float fraction) {
+        if (mDrawable == null || mAnimatorSet == null) return;
+
+        ArrayList<Animator> animators = mAnimatorSet.getChildAnimations();
+        for (Animator animator : animators) {
+            if (animator instanceof ValueAnimator) {
+                ((ValueAnimator) animator).setCurrentFraction(fraction);
+            }
+        }
+
+        mDrawable.invalidateSelf();
+    }
+
+    private void getAnimatorSetViaReflection() {
+        try {
+            Field _mAnimatorSet = AnimatedVectorDrawable.class.getDeclaredField("mAnimatorSet");
+            _mAnimatorSet.setAccessible(true);
+            mAnimatorSet = (AnimatorSet) _mAnimatorSet.get(mDrawable);
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            Log.e(TAG, "Could not get mAnimatorSet via reflection", e);
+        }
+    }
+}